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VULNERABILITIES

CVE-2026-56181 Details

Description

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:8.3 HIGHVector:CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56181 [email protected]PatchVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-346Origin Validation Error[email protected]

Affected Products

ProductVersions
microsoft windows 11 24h2
< 10.0.26100.8875

CPE

  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft windows 11 25h2
< 10.0.26200.8875

CPE

  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft windows 11 26h1
< 10.0.28000.2525

CPE

  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft windows server 2025
< 10.0.26100.33158

CPE

  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-56181
NVD Published Date:
Jul 14, 2026
NVD Last Modified:
Jul 22, 2026
Source:
[email protected]
CVE-2026-56181 Details - Not Deferred